Marquise|Lab Grown|IGI

3.80ct E SI1 Marquise Lab Grown Diamond

EX • E/SI1 • IGI LG812617978

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG812617978

Diamond specifications and retailer prices

From $512 USD
As of October 29, 2026
Save $5,218 USD (91%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $5,730 USD at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

About this 3.8ct lab-grown marquise diamond

This 3.8ct lab-grown marquise sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG812617978 or 812617978. Listed at 3 retailers as of October 28, 2026, with prices from $512 to $5,730, a $5,218 spread on the same certified stone. Brilliant Earth lists it at $5,730. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

3.80
Carat
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.7°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG812617978
Dimensions16.56 × 8.06 × 5.03 mm
L/W Ratio2.05
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
16.56 mm8.06 mm3.80 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG812617978
Side View
Table 59.0%Crown 34.7°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 62.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 29
Current: $5,730 USD|Low: $512 USD|High: $5,740 USD|Avg: $2,443 USD
Brilliant Earth
Retailer 2
Retailer 3
October 29, 2026
Retailer 3$512 USD
Retailer 2$970 USD
Brilliant Earth$5,730 USD

34 data points across 3 retailers

3 retailers$512 USD to $5,730 USD

A
Cheapest Retailer
-
$512 USD
Final sale: no returns
A
Retailer 2
-
$970 USD
£764 GBP
View
Most Expensive
B
Brilliant Earth
21226659A · Oct 28
$5,730 USD
View
2 more retailers have this diamond
Prices start from $512 USDSave up to $5,218 USD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
3.80ct Marquise
$512 USD